摘要
硼氢化钠在乙二醇的碱性溶液中比在水溶液中更稳定,使还原醋酸钴制备金属Co纳米颗粒的反应平稳进行,制备出六方晶型的Co纳米颗粒,平均粒径为50.2 nm.原子力显微镜和激光散射分析表明, Co纳米粒子为类球形.制备Co纳米粒子的最佳温度为60℃,最佳pH为11-12.用不同种类的表面活性剂对Co纳米颗粒进行表面修饰,能减少其在正己烷中的软团聚,以吸附作用为主的非离子表面活性剂的效果最佳,可以使团聚体的平均尺寸由80.0 nm降低至50.2 nm.
Cobalt nanoparticles with hexahedron crystal structure have been prepared using the alkalescent soluction containing glycol as solvent and NaBH4 as reducing agent. The average diameter of these nanoparticles measured by N-14 plus laser method is 50.2 nm. The AFM observation showed that the Co nanoparticles are spherical. The optimal parameters are the pH value of 11 and temperature of 60℃ for obtaining the smallest nanoparticle. The surfactant was employed to decrease the soft agglomeration of the cobalt nanoparticles in the hexane. The best surfactant and its best dosage were found in this experiment. The average particles size decreases from 80.0 nm to 50.2 nm by using the proper surfactant.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2005年第2期153-158,共6页
Chinese Journal of Materials Research
基金
国家自然科学基金10405018广东省自然科学基金021286
04011311深圳市自然科学基金资助项目~~
关键词
金属材料
纳米粒子
钴
原子力显微镜
激光散射
表面修饰
metallic materials, nanoparticle, cobalt, AFM, N-14 plus laser, surface modification
